Upgrading IOS

I've got an ASA 5510 that is running 8.0(4) and I'm attempting to get to 8.2.2. I've gotten the new version sitting on disk0. I messed something up on the attempt to upgrade. I think I need to clear an entry or 2 out of the boot order, but I don't know how.

Featured Post

Help prevent cyber-threats and provide solutions to safeguard our global digital economy. Earn your MS in Cybersecurity. WGU’s MSCSIA degree program was designed in collaboration with national intelligence organizations and IT industry leaders.